"by a singular grace and privilege"

Today the Church celebrates the Solemnity of the Immaculate Conception of the Blessed Virgin Mary. Of course, this does not refer to the conception of Jesus by the Holy Spirit, thus becoming "incarnate of the Virgin Mary." Rather, it is a celebration of the conception of our Blessed Mother herself by her mother, who tradition hands on was named Anne. Saint Anne's conception of the Blessed Virgin Mary happened in the normal way.

What the Immaculate Conception refers to is set forth very well in the dogmatic formula found in the Papal Bull Ineffabilis Deus, promulgated by Bl. Pope Pius IX in 1854:

We declare, pronounce, and define that the doctrine which holds that the most Blessed Virgin Mary, in the first instance of her conception, by a singular grace and privilege granted by Almighty God, in view of the merits of Jesus Christ, the Savior of the human race, was preserved free from all stain of original sin, is a doctrine revealed by God and therefore to be believed firmly and constantly by all the faithful

It was not until four years after the promulgation of Ineffabilis Deus that the Blessed Virgin appeared to the peasant girl, Bernadette Soubrious, introducing herself to Bernadette as "the Immaculate Conception."

Since the dogma of papal infallibility was not formally defined until 1870, the apparitions of Our Lady at Lourdes, France served as a kind of proof of the truth of the dogma of this de fide belief. It's important to keep in mind that dogmas do not appear out of nowhere. They are tenets of the faith that have to be shown both to be a part of divine revelation and, even if in seed-like form, believed always, everywhere, and by all. While theological reflection, examination, and even disputation are vital for the Church, even with regard to dogmas of the faith, for faithful Catholics, belief or at least assent to dogmatic teaching is of the utmost importance.

The Immaculate Conception of Los Venerables (Soult Madonna), by Bartolomé Esteban Murillo, 1660-1665

It surprises many people that since the First Vatican defined the dogma of papal infallibility in the constitution Pastor Aeternus, which was promulgated by the same Pope Pius IX 1870, there has only been one exercise of papal infallibility. This occured in the Jubilee Year of 1950, when Bl. Pope Pius XII infallibly proclaimed the bodily Assumption of the Blessed Virgin Mary into heaven in Munificentissimus Deus.

Falling as it does during the season of Advent, today's Solemnity, which, this year, is moved to Monday because the Second Sunday of Advent takes precedence, also reminds us something very important: the Son of God, as it pertains to his humanity, is consubstantial with His Mother, the Blessed Virgin Mary. And so, through Blessed Mother, who is also our Mother, is consubstantial with us.

To answer a popular song of yesteryear, "What If God Was One of Us?," through the womb of the Blessed Virgin Mary, He became one of us. Through His Holy Spirit he remains present not just among us but, if we let Him, in us. If He is in us, then we can make Him present to others. This the famous third advent of our Lord set forth by Saint Bernard of Clairvaux in an Advent sermon a long time ago. Like the Gospel itself, while old, it is ever new.

Today, pray Our Lady's Rosary, say a Memorare or two, or three... Of course, observe this Holy Day of Obligation, this gift of the Church. Don't neglect to ask for the intercession of Saint Bernadette.